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Finding the Fourth Proportional to 1,161.35, 1,602.91 and 908.79

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Solution

The fourth proportional to 1,161.35, 1,602.91 and 908.79 is: 1,254.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,161.35 : 1,602.91 = 908.79 : x
  2. Step 2: Convert to fraction form
    1,161.35/1,602.91 = 908.79/x
  3. Step 3: Cross multiply
    1,161.35x = 1,602.91 × 908.79
  4. Step 4: Simplify right side
    1,161.35x = 1,456,698.59
  5. Step 5: Solve for x
    x = 1,456,698.59/1,161.35
  6. Step 6: Final answer
    x = 1,254.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.